The determination of coefficients for size specific effective dose for adult and pediatric patients undergoing routine computed tomography examinations.
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引用次数: 0
Abstract
The effective dose resulting from computed tomography (CT) scans provides an assessment of the risk associated with stochastic effects but does not account for the patient's size. Advances in Monte Carlo simulations offer the potential to obtain organ dose data from phantoms of varying stature, enabling derivation of a size-specific effective doses (SEDs) representing doses to individual patients. This study aimed to compute size-specific k-conversion factors for SED in routine CT examinations for adult and pediatric patients of different sizes. Radiation interactions were simulated for adult and pediatric phantom models of various sizes using National Cancer Institute CT version 3.0.20211123. Subsequent calculations of SED were performed, and coefficients for SED were derived, considering the variations in body sizes. The results revealed a strong correlation between effective diameter and weight, observed with size-specific k-conversion factors for adult and pediatric phantoms, respectively. While size-specific k-conversion factors for CT brain remained constant in adults, values for pediatric cases varied. When using the tube current modulation (TCM) system, size-specific k-conversion factors increased in larger phantoms and decreased in smaller ones. The extent of this increase or decrease correlated with the set TCM strength. This study provides coefficients for estimating SEDs in routine CT exams. Software utilizing look-up tables of coefficients can be used to provide dose information for CT scanners at local hospitals, offering guidance to practitioners on doses to individual patients and improving radiation risk awareness in clinical practice.
计算机断层扫描(CT)产生的有效剂量可以评估与随机效应相关的风险,但并不考虑患者的体型。蒙特卡罗模拟技术的进步为从不同身材的模型中获取器官剂量数据提供了可能,从而可以推导出代表个体患者剂量的特定身材有效剂量(SED)。本研究旨在计算成人和儿童不同体型患者常规 CT 检查中 SED 的特定体型 k 转换因子。使用 NCICT 3.0.20211123 版模拟了成人和儿科不同体型模型的辐射相互作用。随后对 SED 进行了计算,并根据体型的变化得出了 SED 系数。结果表明,有效直径与体重之间存在很强的相关性,成人和儿童模型分别具有特定尺寸的 k 转换系数。虽然成人脑部 CT 的特定尺寸 k 转换因子保持不变,但儿科病例的数值却各不相同。在使用管电流调制(TCM)系统时,较大模型的尺寸特异性 k 转换因子增加,较小模型的尺寸特异性 k 转换因子减少。这种增减的程度与设定的 TCM 强度相关。这项研究提供了在常规 CT 检查中估算 SED 的系数。利用系数查找表的软件可为当地医院的 CT 扫描仪提供剂量信息,为从业人员提供个体患者剂量指导,提高临床实践中的辐射风险意识。
期刊介绍:
Journal of Radiological Protection publishes articles on all aspects of radiological protection, including non-ionising as well as ionising radiations. Fields of interest range from research, development and theory to operational matters, education and training. The very wide spectrum of its topics includes: dosimetry, instrument development, specialized measuring techniques, epidemiology, biological effects (in vivo and in vitro) and risk and environmental impact assessments.
The journal encourages publication of data and code as well as results.